diff --git a/sys/dev/usb/wlan/if_urtwnvar.h b/sys/dev/usb/wlan/if_urtwnvar.h
index 2c720fc3868..8eb7fb64a1e 100644
--- a/sys/dev/usb/wlan/if_urtwnvar.h
+++ b/sys/dev/usb/wlan/if_urtwnvar.h
@@ -170,7 +170,7 @@ struct urtwn_softc {
 					    int, uint8_t, uint32_t);
 	int				(*sc_power_on)(struct urtwn_softc *);
 
-	struct ieee80211_node		*node_list[R88E_MACID_MAX];
+	struct ieee80211_node		*node_list[R88E_MACID_MAX + 1];
 	struct mtx			nt_mtx;
 
 	uint8_t				board_type;